Geometrical and electrical properties of NTC polycrystalline thermistors vs. Changes of sintering parameters
Keyword(s):
NTC thermistor powder was made of a Mn, Ni, Fe and Co oxide mixture calcinated at 1050?C / 60 min. The powder was milled in a ball mill down to an average particle diameter of 0.9 ?m. Small disc shaped pills of the powder obtained were made by pressing with a pressure of 2.5 MPa. The pills were sintered in the temperature range of 900-1400 ?C for 30-240 min. The volume and specific volume resistivity change were measured as a function of sintering conditions. Microstructure development was observed using a SEM microscope. Using the results obtained, optimization of sintering parameters was performed in order to determine optimal electrical properties of the selected thermistor composition.
2011 ◽
Vol 374-377
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pp. 1537-1540
2014 ◽
Vol 1004-1005
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pp. 311-314
2015 ◽
Vol 820
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pp. 155-160
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